Multi-purpose sealing module for plastic film based bags and pouches making machine

Abstract

Multi-purpose sealing module ( 20 ) for machine ( 10 ) to manufacture heat-sealed plastic film based bags comprises a servo motor driven common drive shaft ( 30 ) in keyed connection with eccentric cams ( 40 a, 40 b ) and ( 50 a, 50 b ) such that eccentricity is equal and in opposite directions. Crank arms ( 60 a, 60 b ) are connected to the eccentric cams ( 40 a, 40 b ) though bearings ( 80 a, 80 b ) and through bearings ( 120 a, 120 b ) to linear guide rods ( 100 a, 100 b ). Linear guide rods ( 100 a, 100 b ) are in rigid connection with upper seal beam ( 140 ). Crank arms ( 70 a, 70 b ) are connected to the eccentric cams ( 50 a, 50 b ) though bearings ( 90 a, 90 b ) and through bearings ( 130 a, 130 b ) to connecting rods ( 110 a, 110 b ). Connecting rods ( 110 a, 110 b ) are in rigid connection with lower seal beam ( 150 ). Movement of lower seal beam ( 150 ) is guided by linear guide rods ( 100 a, 100 b ). Angular movement of common drive shaft ( 30 ) gives simultaneous linear movement in opposite directions to upper seal beam ( 140 ) and lower seal beam ( 150 ) controlling the gap between a sealing jaw connected to upper seal beam ( 140 ) and a sealing jaw connected to the lower seal beam ( 150 ). Seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft ( 30 ) are controlled by a programmable controller.

We claim: 
     
         1 . A multi-purpose sealing module ( 20 ) for a machine ( 10 ) to manufacture heat-sealed plastic film based bags and pouches, comprising
 a. a common drive shaft ( 30 ) driven by a servo motor or a pneumatic rotary actuator and in keyed connection with a first pair of eccentric cams ( 40   a ,  40   b ) and a second pair of eccentric cams ( 50   a ,  50   b ) such that eccentricity is equal and in opposite directions;   b. a first pair of crank arms ( 60   a ,  60   b ) connected to the first pair of eccentric cams ( 40   a ,  40   b ) though a first set of bearings ( 80   a ,  80   b ) and through a second set of bearings ( 120   a ,  120   b ) to linear guide rods ( 100   a ,  100   b );   c. the linear guide rods ( 100   a ,  100   b ) in rigid connection with upper seal beam ( 140 );   d. a second pair of crank arms ( 70   a ,  70   b ) connected to the second pair of eccentric cams ( 50   a ,  50   b ) though a third set of bearings ( 90   a ,  90   b ) and through a fourth set of bearings ( 130   a ,  130   b ) to connecting rods ( 110   a ,  110   b );   e. the connecting rods ( 110   a ,  110   b ) in rigid connection with lower seal beam ( 150 );   f. movement of the lower seal beam ( 150 ) guided by the linear guide rods ( 100   a ,  100   b ); and   g. angular movement of the drive shaft ( 30 ) giving simultaneous linear movement in opposite directions to the upper seal beam ( 140 ) and the lower seal beam ( 150 ) controlling the gap between a sealing jaw connected to the upper seal beam ( 140 ) and a sealing jaw connected to the lower seal beam ( 150 ); and seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft ( 30 ) controlled by a programmable controller.   
     
     
         2 . The multi-purpose sealing module ( 20 ) as claimed in  claim 1  wherein the common drive shaft ( 30 ) is driven by a pneumatic rotary actuator. 
     
     
         3 . The multi-purpose sealing module ( 20 ) as claimed in  claim 1  wherein the common drive shaft ( 30 ) is connected with the first pair of eccentric cams ( 40   a ,  40   b ) and the second pair of eccentric cams ( 50   a ,  50   b ) using clamping bushes. 
     
     
         4 . A multi-purpose sealing module ( 220 ) for a machine ( 210 ) to manufacture heat-sealed plastic film based bags and pouches, comprising
 a. a common drive shaft ( 230 ) driven by a servo motor or a pneumatic rotary actuator and in keyed connection with a first pair of eccentric cams ( 240   a ,  240   b ) and a second pair of eccentric cams ( 250   a ,  250   b ) such that eccentricity is equal and in opposite directions;   b. a first set of crank arms ( 260   a ,  260   b ) connected to the first pair of eccentric cams ( 240   a ,  240   b ) though a first set of bearings ( 280   a ,  280   b ) and through a second set of bearings ( 320   a ,  320   b ) to linear guide rods ( 300   a ,  300   b );   c. the linear guide rods ( 300   a ,  300   b ) in rigid connection with front seal beam ( 340 );   d. a second set of crank arms ( 270   a ,  270   b ) connected to the second pair of eccentric cams ( 250   a ,  250   b ) though a third set of bearings ( 290   a ,  290   b ) and through a fourth set of bearings ( 330   a ,  330   b ) to connecting rods ( 310   a ,  310   b );   e. the connecting rods ( 310   a ,  310   b ) in rigid connection with rear seal beam ( 350 );   f. movement of the rear seal beam ( 350 ) guided by the linear guide rods ( 300   a ,  300   b ); and   g. angular movement of the drive shaft ( 230 ) giving simultaneous linear movement in opposite directions to the front seal beam ( 340 ) and the rear seal beam ( 350 ) controlling the gap between a sealing jaw connected to the front seal beam ( 340 ) and a sealing jaw connected to the rear seal beam ( 350 ); and seal time and seal pressure of sealing of plastic film based bags and pouches; and angular movement of the drive shaft ( 230 ) controlled by a programmable controller.   
     
     
         5 . The multi-purpose sealing module ( 220 ) as claimed in  claim 4  wherein the common drive shaft ( 230 ) is driven by a pneumatic rotary actuator. 
     
     
         6 . The multi-purpose sealing module ( 220 ) as claimed in  claim 4  wherein the common drive shaft ( 230 ) is connected with the first pair of eccentric cams ( 240   a ,  240   b ) and the second pair of eccentric cams ( 250   a ,  250   b ) using clamping bushes.